Sewing machine for sewing hides and skins



Nov. 26, 1963 N. MARFORIO 3,111,918

SEWING MACHINE FOR SEWING HIDES AND SKINS Filed April 4, 1961 6 Sheets-Sheet l Nov. 26, 1963 MARFORIO 3,111,918

SEWING MACHINE FOR SEWING HIDES AND SKINS Filed April 4, 1961 6 Sheets-Sheet 2 Fig. 3 1 86 Nov. 26, 1963 N. MARFORIO 3,111,918

SEWING MACHINE FOR SEWING HIDES AND SKINS Filed April 4, 1961 6 Sheets-Sheet 3 Fig. 5

Nov. 26, 1-963 7 N. MARFORIO 3,111,918

SEWING MACHINE FOR SEWING HIDES AND SKINS Filed April 4, 1961 6 Sheets-Sheet 4 Fig. 6

VII

9 72 7 so 38 37 7 f 74 Q 87 as 42 129 4a 43 Nov. 26, 1963 N. MARFORIO 3,111,918

SEWING MACHINE FOR SEWING HIDES AND SKINS Filed April 4, 1961 6 Sheets-Sheet 5 Nov. 26, 1963 N. MARFORIO 3,111,918

SEWING MACHINE FOR SEWING HIDES AND sxms Filed April 4, 1961 6 Sheets$heet 6 Fig. 8

122 so 29 7053 73 74746 17 37 139 6 130 o 2 23 T9) 43 81 71 T a v. 88 39 48 5 59 22 United States Patent '0 'This'invention relates to a'sewing machine 'for hides and skins or knitted fabrics having counter-rotating work feed cups, adapted to carry out one or multiple thread over-edge stitching, andmore particularly tothe type in which the vertical shaft supporting the driven feed cup is oscillated from the main driving shaft of the machine through a one-way coupling and carries abrake which keeps it against rotation when the work is not being fed. This invention provides a sewing machine, of the type referred to above having a mechanism controlling the "driven-cup and adjusting-the stitch length, which is sim- -ple in construction and inexpensive, reliable and easy to operate. Moreover, the invention provides a small sizemachine thereby to reduce the space occupied by the machine beneath the stitch forming members in order to facilitate the operators work in sewing clumsy hides and skins, furs or other work.

Accordingto the invention the supporting shaft for the .-driven [feed cup, the one-way coupling and brake cooperating with the shaft are accommodated by a recess in a projection or prominence of limited width on the forward wall of the machine frame. The mechanisms transmitting motion from the main driving shaft of the machine to the feed cups for feeding of the material are "arranged within the frame.

Other characteristic features and advantages of the invention will be clearly understood from the appended description referring by way of a non-limiting example to the accompanying drawings which show a preferred embodiment, wherein:

FIGURES 1 and 2 are side elevation views of the machine partly in section,

FIG. 2a is a fragmentary enlarged sectional view of a portion of FIG. 2,

FIG, 3 is a side elevational view partly in section of the machine from the side opposite to the views in FIG- URES 1 and 2,

FIG. 4 is a fragmentary sectional view taken on line IVIV of FIG 2,

FIG. 5 is a front elevational view of the machine,

FIG. 6 is a sectional view taken on line VI-VI of FIG. 3,

FIG. 7 is a sectional view taken on line VII'-VII of FIG. 6,

FIG. 8 is a plan view of 'the internal members of the machine and is a view of the machine with the cover thereof removed,

FIG. 9 is a sectional view taken on lines IXIX of FIG. 7.

In the drawings, a machine frame 1 is secured by means of screws 5 to a box-shaped bedplate 2 closing the frame at the bottom and acting as a sump for the oil lubricating the machine parts. The top end of the frame is closed by a cover 3 secured to the frame by means of screws 4. A supporting table 6 for the machine is secured to the bedplate 2 preferably rubber pads '7 (FIG. 5) are disposed between the bedplate 2 and the table '6 alternatively, the bedplate 2. can be directly screwed to the table 6.

The frame 1 is formed at the front with a projection 1a in which a driven feed cup 8 is journalled. The cup 8 cooperates with an idle cup 9 which presses the work 3,1 1 1,918 Patented Nov. 26, 1963 ice against the driven cup 8. The cup 9' is rotatably mounted on an arm 10 (FIG. 7) secured to the end of a rod 11 projecting fromthe frame, securedly fixed by means of split-collars 12 and 13 to a rod 1'4 guided insuitable recesses in the frame for displacement in a longitudinal direction of the machine under the thrust from a lever 15. The lever 15 is securedly fixed to a pivot 16, the outwardly extending end of which carries an arm 17 (FIG. 1) having articulated to its free end a link 18 which can he moved downwardly by a lever 19 articulated at 20 to a support fixed to the table 6,. The lever 19 carries on a free end 21 thereof a chain connected with a pedal (not shown). Alternatively, the link 18 can be operated through a toggle mechanism, not shown.

The split-collar 13 (FIG. 7) carries a plate 22 having attached thereto a traction spring 23 secured to a screwthreaded spindle 24 screwed into a recess in a nob 25 extending from the frame 1. By rotating the knob 25 in a suitable direction'the tension of the spring 23, and there tore pressure by the cup '9 on the work engaging the driven 'cup 8, can be adjusted. I v

A needle 26 is carried above the rotating cups '8, 9 (FIG. 3) by a needle bar 27 mounted for horizontal displacement in guide bushings 2*8, v29 fitted in suitable holes bored in the walls of the machine frame 1. A cap 30 screwed on the bushing 29' is provided in order to prevent leakage of lubricating oil. A thread 34 (FIG. 5) is fed to the needle through a device 36 which acts to adjust the thread tension.

A looper 31 (FIG. l) is carried above the needle 26 in proximity to the contact zone of the cups 8 and 9 by a supporting shaft 32, of which the portion extending beyond the frame'is covered in'part by a rubber bellows 33 which is likewise adapted to prevent oil leakage.

A hand wheel 37 (FIG. 6) is provided with-a V-groove for a driving belt 38. The hand wheel is secured to one end of the main driving shaft 39 'rotatably mounted in bushings 40, 41 fitted into through holes bored in lateral bulges or bosses on opposite sides of the frame.

An eccentric 42 is keyed to the main shaft 39 near the longitudinal middle plane of the machine and carries a connecting rod 43 having its end articulated at 44 to an arm 5 secured ly connected by a screw 46 to the needle bar 27. Rotation of the 'eccentric42 reciprocates the needle bar 27 and needle through the connecting rod 43 and arm 45.

I 'An eccentric 47 is keyed near'the eccentric 42to the shaft 39 on the remote side of the hand Wheel 37 and carries a connecting rod 48 (FIG. 1), the small end of which in turn carries a fork 49 adjustably secured by means of locknuts. 50 in a cross bore in the foot of the connecting rod. The top end of the fork 49 is fulcrumed by a pivot 51 to a collar -52'clamped by means of a screw 53 to a cross pivot 54 FIG. 8). The latter is rotatably supported by a bracket 55 secured by means of screws 56 to an inner projection on'the frame 1 on the side of the latter carrying the stitch forming members (FIG- URES 'l and 8). The pivot 54 carries a crank 57 which is provided with a pin 58 engaging a member to be more fully described hereafter which moves the bar 3?. carrying the looptaker 3-1. A split-collar 59 is secured to the end of the pin 58 and is closed by a screw 60. The collar 59 acts to adjust the position of the member engaged by the pin 58 on the crank 57. The shaft 32. carrying the looptaker 3 1 is supported by a sleeve 61 (FIG. 1) for rotation but is kept against endwise displacement with respect to the sleeve. The sleeve 61 carries, for this purpose, a beam 62 having a hole bored therein for the pin 58 and a tab 63 in which-the end of the bar 32 remote from the looptaker 31 is supported. A split-collar 64, together with a split-collar 65 adjacent the tab 63, prevents endwise movements of the bar 32 with respect to the sleeve 61, hence prevents movement relative to the beam 62. The end of the beam 62 remote from the hole for the pin 58 is hinged at 66 to the crank 67 (FIG. 6) supported for oscillation by a T-shaped support 68. A pin 69 on crank 67 is positioned by a collar 70 and a washer 71. A shank 72 of the T-shaped support is received by a longitudinally split bushing 63 clamped to a shank 72 by means of a screw 74. The bushing 73 is securedly connected to an internal projection on the frame by means of a pivot 75 locked by a screw 76.

With the above described construction the shaft 32 carrying the looptaker 31 can be set at a preselected angle to a horizontal plane to accordingly determine the position of the path of the looptaker tip with respect to the needle path during sewing. The position of the path to be described by the tip of the looptaker 31 is further affected by the position taken by the fork 49 with respect to the connecting rod 48. The position of the fork 49 can be varied by acting on the locknuts 50 in order to vary the width of oscillation of the pivot 54 carrying the crank 57, the pin 58 of which engages the beam 62.

The parts described heretofore effect longitudinal movement and adjustment of the shaft 32 carrying the looptaker 31. In order to form the stitch the shaft 32 should perform in addition to endwise displacements an oscillation about its axis. To this end the collar 65 (FIG- URES l and 6) carries a cross pin 77 having a ball 78 fitted thereon, which is received by a cam groove 79 formed in the forward face of a disc 80 keyed to the main driving shaft 39.

Rotation of the disc 80 results in radial displacements of the ball 78, hence periodical oscillations of the pin 77 and looptaker collar 65, and oscillations of the looptaker 31 about the axis of the bar 32.

The disc 80 is provided with a hub having a peripheral serration 81 engaging by friction the disc 82 driving a pump 83. The pump takes a suction on lubricant collected in the sump of the bedplate 2 through a. cleaner 84 and pumps it to a tube 85 from which the oil is splashed against the inner surface of a dome 86 of transparent material fitted in a central opening in the cover 3.

The main driving shaft 39 has keyed thereto, near the bushing 41, an eccentric 87 (FIGURES 6 and 2) operating a connecting rod 88. The small end of the connecting rod 88 has a cap 88a, 88b enclosing a ball 89. The ball 89 is retained by means of a screw 90 on a rod 91 terminating at its lower end in an eyelet oscillating about a pivot 93 on an arm 94 of a crank bell lever fulcrumed to a pivot 95 fast with an internal bracket 96 on the frame 1. The other arm 97 of the bell crank lever has its end bifurcated to enclose a slide in the form of a square block 98 rotatable about a pin 99 carried by an arm 97. The block 98 is slidably mounted in a groove 100 in a lever 101 fast witht he bottom portion 102 of a casing, the top portion 103 of which is held stationary with respect to the frame 1 by a pin 104 as shown in FIG. 2a. The casing halves 102, 103 enclose cams 105, 106, respectively, cooperating with rollers 107, 108, respectively, each pressed by a plate 109 biased by a small coiled spring 110 (-FIG. 4). The cams 105, 106 are interconnected by screws 111 and oppositely mounted so that the cam 105 in the casing half 102 is carried along in rotation by the said half, while the cam 106 in the cats ing half 103 does not engage the latter and acts as a brake by engaging the casing half 103 which is held stationary with respect to the frame 1 while the casing half 102 is swung in an opposite direction.

The screws 111 connect the cams to a flange 112 on a bushing 113 clamped by a collar 114 about the bottom end of a shaft 115 supporting the driven feed cup 8 which is rotatable with respect to the casing halves 102, 103. The casing 102, 103 is received by a recess 1b in the bottom portion of the forward projection In on the frame 1. The shaft 115 is rotatable within bushings 1'16, 117 fitted into the ends of a vertical bore con- 4 necting the recess 1b with the outside. The bushings 116, 117 are formed with flanges in order to take up axial thrust by the hub on the cup 8 and casing half 103. The cup 8 is secured to the top end of the shaft by means of a screw 118 and a lock washer 119.

The portion of the rod 91 between the ball 89 and eyelet 92 extends through a cylindrical bushing 120 rotatably mounted in an eyelet 121 on a lever 122 swingable about a pivot 123 secured to the side wall of the frame 1. The lever 122 is formed with an intermediate bulge 124 recessed at 125 to receive an eccentric 126 fast with a pivot 127 reaching within the recess 125 through an arcuate slot 128. The pivot 127 extends through the side wall of the frame 1 and carries a knob 129 (FIGS. 5 and 6) secured to the pivot 127 by means of screws 134. The knob is provided with a pointer 139 (FIG. 6) cooperating with a scale provided on the plate 140 (FIGURES 5 and 6) mounted externally of the frame wall. The knob 129 moreover carries a lever 130 for use as a handle to facilitate operation. Two frusto-conical friction washers 131 and 132 (FIG. 6) are provided, the tension of which is adjusted by means of a screw 133.

The members transmitting motion to the driven feed cup 8 on the machine and adjusting the width or amplitude of rotation of the cup 8 on each turn of the main driving shaft 39 of the machine, thereby feeding the work, operate as follows:

Rotation of the driving shaft 39 is transmitted to the eccentric 87 which oscillates the connecting rod 88. The rod 88 swings the rod 91 about the bushing 120. The angular movements of the rod 91 are transmitted to the bell crank lever 94, 97 which swings the lever 101 fast with the bottom half 102 of the casing enclosing cams 105, 106. The bottom portion 102 of the casing transmits its oscillation through rollers 107 to the cams 105, 106 interconnected by screws 111 and to the bushing 113 secured to the lower end of the shaft 115 driving the disc 8. During swinging of the lever 101 fast with the bottom half 102 of the casing in the direction of the arrow 136 (FIG. 4), the cam 105 is carried along in rotation together with the shaft 115 carrying the cup 8. The cam 106 freely rotates with respect to the top half 103 of the casing which is held stationary with respect to the frame 1 by pin 104. Whereas on swinging of the lever 101 fast with the bottom half 102 of the casing in the direction of the arrow 135, the cup 8 is not advanced, rotation of the shaft 115 in the direction of the arrow 136 (FIG. 4) being totally prevented since the cam 106 is retained by the rollers 108 which are wedged between the cam surfaces on the cam 106 and stationary top half 103 of the casing.

It will be understood from the above that the shaft 115 is oscillated through a one-way coupling comprising the casing half 102, cam 105 and rollers, 107 and carrying a brake comprising the casing half 103, cam 106 and rollers 108.

In order to vary the width of oscillation of the shaft 115 carrying the cup 8 in the direction of the arrow 136, to thereby adjust the stitch length, all that need be done is to vary the position of the bushing 120 acting as a fulcrum for oscillation of the rod 91. For this purpose the knob 129 is conveniently rotated by the use of the lever 130. Rotation of the knob 129 results in rotation of the pivot 127 and eccentric 126 which acts on the lever 122 to swing it with respect to the axis of the pivot 123.

The arrangement described above of the members driving the cup 8 is particularly advantageous. The free wheel device and brake cooperating with the shaft 115 carrying the cup 8 and with the leverage transmitting movement to the cup from the main driving shaft 39, are arranged within the forward projection of relatively small width on the frame 1. The device is easily assemblable on the shaft 115 and accessible for inspection and repair, without the members associated with the shaft 39 interfering therewith, the latter being moreover easily accessible on account of the fact that the free wheel device and brake are arranged externally of the inner space in the frame. The reduced size of the forward projection on the frame 1, which acts as a stationary support for the driven cup 8 affords excellent accessibility to the work on a vertical line extending through the contact region of the feed cups and laterally thereof, thereby facilitating the operators task. The mechanism for varying feed of the work by the cup 8 is extremely simple in construction and affords a quick and accurate adjustment of the stitch length as desired without requiring special measures for locking the mechanism in a desired position by virtue of the provision of resilient washers 131, 132 which brake any undesirable movement of the knob 129 and of the coupling of the eccentric 12.6- and lever 122.

What I claim is:

1. In a sewing machine for use on furs, hides, skins or knitted fabrics, said machine having a frame, work-feed counter-rotating cups, and means for effecting one or multiple thread overedge stitching, in combination, a main driving shaft rotatably mounted in said frame, a vertical shaft for supporting and driving a driven one of said feed-cups, a transmission between said vertical shaft and said machine main driving shaft for driving said vertical shaft from said main shaft, a oneway coupling in said transmission for ensuring intermittent rotary movement of said driven feed cup and a brake for restraining said vertical shaft and said driven feed cup against rotation during intervals other than when Work is being fed, said frame having a forward wall, a prominence on said forward wall of said frame extending vertically thereon, said prominence having a Width narrower than the length of said forward wall and defining a housing in which are arranged said vertical supporting shaft for said driven feedcup, said oneway coupling and said brake, said drive feed cup being mounted immediately above the adjacent said forward wall prominence for rotation relative to the top of said forward wall prominence, and said oneway coupling and brake being arranged axially along said vertical shaft to permit housing in said prominence.

2. A sewing machine according to claim 1, having a lever fixed to said oneway coupling and extending longitudinally within said machine frame, a vertical pivot supported by said frame, a bell-crank lever rotatable about said pivot, a slide connected to said first-mentioned lever and articulated to one arm of said bell-crank lever, an

upstanding rod oscillatable in a plane perpendicular to the axis of said main shaft, said upstanding rod having a lower end articulated to the other arm of said bell-crank lever, an oscillation fulcrum adjustable in height for said upstanding rod, and a second rod connected to said upstanding rod and an eccentric for actuating said second rod connected to said main shaft to oscillate said upstanding rod.

3. A sewing mahcine according to claim 2, in which said oscillation fulcrum for said upstanding rod comprises a bushing having a diametrical bore through which said upstanding rod extends, a fixed pivot having a free opposite end and an eyelet at its free end for rotatably supporting said bushing, an eccentric cooperative with said lever for variably adjusting the angular position of the last-mentioned lever relative to said fixed pivot thereby to variably position said bushing axially on said upstanding rod to vary the amplitude of oscillation of said upstanding rod thereby to vary the amplitude of rotary movement of said driven cup, means cooperative with said eccentric to variably set the amplitude of oscillation of said upstanding rod thereby to set the amplitude of rotary movement of said driven cup comprising a control knob disposed externally of said machine frame for actuating said eccentric, a pointer carried by said knob, and a scale cooperating with said pointer provided on said machine frame for indicating the amplitude of angular movement of said driven cup and the amplitude of the stitching.

4. A sewing machine according to claim 3 including means comprising two frusto-conical tension washers interposed between said knob and machine frame to set the sensitivity of said means to variably set the amplitude of oscillation of said upstanding rod.

References Cited in the file of this patent UNITED STATES PATENTS 939,548 Prazak Nov. 9, 1909 1,043,161 Soly et al Nov. 5, 1912 1,275,295 Onderdonk Aug. 13, 1918 2,600,543 Karlsson June 17, 1952 2,899,920 Dunn Aug. 18, 1959 FOREIGN PATENTS 715,138 Great Britain Sept. 8, 1954 

1. IN A SEWING MACHINE FOR USE ON FURS, HIDES, SKINS OR KNITTED FABRICS, SAID MACHINE HAVING A FRAME, WORK-FEED COUNTER-ROTATING CUPS, AND MEANS FOR EFFECTING ONE OR MULTIPLE THREAD OVEREDGE STITCHING, IN COMBINATION, A MAIN DRIVING SHAFT ROTATABLY MOUNTED IN SAID FRAME, A VERTICAL SHAFT FOR SUPPORTING AND DRIVING A DRIVEN ONE OF SAID FEED-CUPS, A TRANSMISSION BETWEEN SAID VERTICAL SHAFT AND SAID MACHINE MAIN DRIVING SHAFT FOR DRIVING SAID VERTICAL SHAFT FROM SAID MAIN SHAFT, A ONEWAY COUPLING IN SAID TRANSMISSION FOR ENSURING INTERMITTENT ROTARY MOVEMENT OF SAID DRIVEN FEED CUP AND A BRAKE FOR RESTRAINING SAID VERTICAL SHAFT AND SAID DRIVEN FEED CUP AGAINST ROTATION DURING INTERVALS OTHER THAN WHEN WORK IS BEING FED, SAID FRAME HAVING A FORWARD WALL, A PROMINENCE ON SAID FORWARD WALL OF SAID FRAME EXTENDING VERTICALLY THEREON, SAID PROMINENCE HAVING A WIDTH NARROWER THAN THE LENGTH OF SAID FORWARD WALL AND DEFINING A HOUSING IN WHICH ARE ARRANGED SAID VERTICAL SUPPORTING SHAFT FOR SAID DRIVEN FEEDCUP, SAID ONEWAY COUPLING AND SAID BRAKE, SAID DRIVE FEED CUP BEING MOUNTED IMMEDIATELY ABOVE THE ADJACENT SAID FORWARD WALL PROMINENCE FOR ROTATION RELATIVE TO THE TOP OF SAID FORWARD WALL PROMINENCE, AND SAID ONEWAY COUPLING AND BRAKE BEING ARRANGED AXIALLY ALONG SAID VERTICAL SHAFT TO PERMIT HOUSING IN SAID PROMINENCE. 